Quick Facts
- Type: Garage Conversion
- Size: 650 sqft
- Timeline: About 4–6 months from permit issuance to final inspection
- Estimate: Property-specific written estimate
- City: Whittier
The Goal
The owners on Anola St in Whittier wanted a two-bedroom ADU — the strongest rental configuration in most of LA County — but a fully detached new build of that size was more than the budget allowed. The goal was to reach a genuine two-bedroom, one-bath layout by reusing the existing garage as the core of the unit and adding just enough new footprint to fit the second bedroom. Getting there meant blending conversion and new-construction work into one seamless, permitted home.
Scope of Work
- 400 sq ft garage conversion reused as the core of the unit
- 250 sq ft new addition to reach a full two-bedroom layout
- Finished 650 sq ft two-bedroom, one-bathroom ADU
- Full kitchen and complete living space
- New and existing structure tied together as one weather-tight envelope
- Whittier permits and final inspection handled in-house
About This Project
This Whittier project on Anola St created a 650 sq ft ADU by combining a 400 sq ft garage conversion with a 250 sq ft addition — enough space for a true two-bedroom, one-bathroom layout.
The conversion-plus-addition approach uses the existing garage structure as the core of the unit and adds just enough new footprint to fit the second bedroom, keeping costs well below a fully detached new build of the same size.
Two-bedroom ADUs are the strongest rental configuration in most of Los Angeles County, serving families rather than just singles or couples.
Vision ADU delivered the project turnkey — design, permits, construction, and final inspection.
Challenges We Solved
Blending conversion and new construction
A hybrid build has to join an existing garage slab and walls with a brand-new addition so the finished unit reads as one home. Matching floor heights, tying in the roofline, and continuing the envelope across old and new construction is the core challenge of this approach.
Verifying the existing garage was suitable to convert
Not every garage is a good conversion candidate. The team assessed the existing slab, walls, and structure before building on it, so the reused portion met the same code standard as the new addition rather than becoming a weak point.
Hitting a two-bedroom layout on a budget
The whole point of the conversion-plus-addition strategy is cost. Fitting a real second bedroom, a full kitchen, and a bath into 650 sq ft — while keeping the build well below the price of a detached unit of the same size — took disciplined space planning.
Project Gallery
The Outcome
- A true two-bedroom, one-bath ADU at less than a detached build's cost
- Existing garage reused as the structural core of the unit
- One of LA County's strongest rental configurations
- Delivered turnkey — design, permits, construction, and inspection
Typical rental income: A two-bedroom, one-bath ADU in Whittier typically rents in the range of roughly $2,300–$3,000 per month, reflecting demand for family-sized rental units in LA County.
Property value: A permitted two-bedroom ADU delivered below the cost of a detached build typically offers an especially strong return, since two-bedroom units command higher rent while the hybrid approach keeps the build cost down.
Budget and rental figures are typical ranges for this project type and city, not a client's private cost or a guarantee. Vision ADU provides a written, itemized estimate after a free site evaluation.
Frequently Asked Questions
What is a garage conversion plus addition?
It is a hybrid ADU that reuses an existing garage as the core of the unit and adds new footprint to reach a larger, more useful layout. On Anola St in Whittier, a 400 sq ft conversion plus a 250 sq ft addition created a full 650 sq ft two-bedroom unit.
Why not just build a detached ADU?
Reusing the garage's existing slab and walls typically costs less than building the same square footage entirely new. For owners who want a two-bedroom unit on a budget, the conversion-plus-addition approach often hits the sweet spot between cost and size.
How much does a conversion-plus-addition ADU cost?
A hybrid two-bedroom ADU budget depends on the condition of the existing garage, the new-construction scope, utilities, and finish selections. Vision ADU prepares a written, itemized estimate after evaluating the property.
Is a two-bedroom ADU a better rental?
In most of LA County, yes — two-bedroom units serve families and roommates, not just singles or couples, which broadens the tenant pool and generally supports higher rent than a studio or one-bedroom.
See More
- View the full project in our portfolio
- A 1,100 sq ft Detached ADU That Lives Like a Full Second Home in Reseda — Reseda, property-specific written estimate
- Building a Complete 320 sq ft Detached ADU on a Tight Coastal Lot in Huntington Beach — Huntington Beach, property-specific written estimate
- A Full Inside-and-Out Home Remodel on Mines Blvd in Whittier — Whittier, property-specific written estimate